Reno:
You wrote..."I'll go it one better: give me an AFCI device that also tells me WHY it tripped. Overload? Ground fault? Arc detected?"
As I don't profess to have a lot of experience with AFCI, as an EC or AHJ 'cause AFCI is 'new' here, I did find this. I don't have the info with me, but doesn't Siemens have LED's on the face of the AF breaker that indicate 'what' caused the trip?
As to installing AF on existing wiring, IMHO that will be a nightmare, based on what I have heard and read.
